Rudder for ships



Feb. 14, 1933. w. scHoLZ RUDDER FOR SHIPS Filed Jan. 8.. 1952 INVENTOR aap y@ JM ATTORNEY) Patented Feb. 14, 1933 STATES RUBBER FOR SHIPS Application filed January 8, 1932, Serial No. 585,529, and in Germany August l?, 1931.

By means of stream line balanced rudders, tor instance as disclosed in the U. S. Patent No. lid-5,916, granted to me on February et, 1930, a very good steering effect on the ship is attained with very little power on the part ct the steering engine. lt was even observed that with ships with particularly sharp after bod eilect of these rudders might be called too i3 good, since these vessels will deviate from their course with even the smallest deflections r the rudder; owing to this sensitiveness to the rudder they become unstable on their course.

Further, tor cases where the application ot only very small forces tor the shitting of the rudder is not required, drop-shaped unbalanced rudder bodies are known, which are located att or" a fired rudder post and 3 where, owing to the proper ratio of rudder `oost thickness to the rudder body thickness, the eiliect of the rudder post upon thecourse of the iiow past the rudder body is diminished to a great extent, so that similar conditions ot flow are attained to a stream line balanced rudder.

The present invention relates to a stream line rudder, in particular for vessels with sharp after body or stern lines. According '5 to the invention a rudder system is evolved from a stream line balanced rudder, a dropshaped profile rudder located aft or" a lined stern post, and a stabilizing area, by means ot which rudder system the aforementioned unstability orn such vessels on their course is 0 a drop-shaped cross-section and in its lower ly or stern lines the steering i part a stream line cross-section. lt is pivoted on the rudder post by means of the guide bearings c and (Z, and its lower portion entends forwardly of the pivot to form the balancing area a. The guide bearings c and (Z are accessible by way of' the removable covers e and j respectively, provided in the rudder balancing body a. The rudder post i) in its upper part is 'forwardly extended 'to form the stabilizing area g. is bolted to the stern trame e' at the flanges i and connected with the heel by means or the bearing shoe t. The rudder weight is talren up by the pint-le m.

This system of two combined rudder bodies and a stabilizing area oders on an ahead course ci' the vessel only a very slightly greater prole resistance than a rudder ywith total stream line proiile. rlhe requisite Jorces for the operation of the rudder may to a very great extent be brought down to the small values orn the rudder operating forces required for a partly stream line balanced rudder, by suitably selecting the ratio between the size o' the lower part ot the rudder and oi the entire rudder. The stabilizing area serves to diminish the course deviations of the vessel.

It is apparent that in carrying out my invention some changes from the construction herein shown and described may be made. l would, therefore, have it understood, that my invention is not limited to the particular details shown and described, but its scope includes their equivalents and such structural departures therefrom as may be required by the diierent forms ot vessels and uses to which it may be applied.

I claim:

l. ships rudder system comprising movable rudder body, consisting in vertical direction or a balanced portion of stream line shape and of a drop-profile unbalanced portion, and a rudder post fixed at its two ends to the ships stern trame and heel, and serving as the pivotal axle for the balanced rudder portion, said post having a tor-v wardly extending, plane stabilizing portion thinner than the leading end of the unbalanced rudder portion and being disposed in line with and forward of the unbalanced rudder portion.

2. A ships rudder system comprising amovable rudder body which consists of a lower balanced portion of stream line shape, and of an upper unbalanced portion of a drop-shape profile, and a rudder postl fixed at its two ends to the ships stern frame and heel, and serving as the pivotal axle for the balanced rudder portion, said post having a forwardly extending, plane stabilizing portion disposed in line with and forward of the unbalanced rudder portion.

3. A ships rudder system comprising` a movable rudder body which consists of a lower balanced portion of stream line shape, and of an upper unbalanced portion of adrop-shape proiile7 and a rudder post ixed at its two ends to the ships stern frame and heel, and serving as the pivotal axle for the balanced rudder portion, said post having,l a forwardly extending, plane stabilizing portion disposed in line with and forward of the unbalanced rudder portion, and being` thinner than the leading end of said unbalanced rudder portion, and of approximately the saine horizontal length as the forwardly extendingbalancing' rudder portion.

VILLIAM SCHULZ. 

